Abstract
A novel (MoCrVMn)2FeB2 based high-entropy cermets were prepared by two-steps method and the microstructure and mechanical properties were investigated. The single-phase (MoCrVMn)2FeB2 powders were synthesized at 1400 °C for 2 h, and subsequently the (MoCrVMn)2FeB2 based high-entropy cermets were prepared via pressureless sintering technique. The results revealed that the phase evolution was as follows: (Mo, Cr, V, Mn, Fe, B) → (Fe2B, V2B3, MoB) → ((FeVMn)2B, (FeVMnCr)2B, Mo2FeB2) → (MoCrVMn)2FeB2. The (MoCrVMn)2FeB2 based high-entropy cermets sintered at 1250 °C showed good denseness and the ceramic phases were uniformly distributed in the metal bond, with the optimal mechanical properties of hardness 1355 HV30 and fracture toughness 19.09 MPa m1/2. With the increase of temperature, the hardness increased first and then decreased, and the fracture toughness was basically unchanged first and then increased, and then decreased. This study provides a new route to further optimize the performance of Mo2FeB2 based cermets.
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